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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
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Síntesis catalizada por fosfina de γ-lactamas tricíclicas y resolución cinética de allenoatos sustituidos por γ

Mingyue Wu1, Zhaobin Han2, Kaizhi Li1

  • 1Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543.

Journal of the American Chemical Society
|September 24, 2019
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Resumen

Un nuevo catalizador quiral, NUSIOC-Phos, permite una reacción de dominó altamente enantioselectiva. Este proceso sintetiza eficientemente complejos lactamos tricíclicos con cinco estereocentros y resuelve alenoatos quirales.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis asimétrica
  • Síntesis estereoselectiva

Sus antecedentes:

  • Los catalizadores quirales son cruciales para la síntesis enantioselectiva.
  • Las reacciones dominó ofrecen vías eficientes a moléculas complejas.
  • Los compuestos espirocíclicos poseen propiedades estructurales y biológicas únicas.

Objetivo del estudio:

  • Introducir un nuevo catalizador de fosfina quiral simétrico con C2, llamado NUSIOC-Phos.
  • Desarrollar un proceso dominó altamente enantioselectivo para la síntesis de gamma-lactamas tricíclicos.
  • Establecer un método de resolución cinética para los alenoatos quirales.

Principales métodos:

  • Catálisis con NUSIOC-Fos derivado del spirobiindano fusionado con ciclohexilo.
  • Reacción de dominó entre pirrolidina-2,3-diones y alenoatos sustituidos por gamma.
  • Resolución cinética de los alenoatos racemicos sustituidos por gamma.

Principales resultados:

  • Se obtienen altos rendimientos y enantioselectividades casi perfectas para los gamma-lactamas tricíclicos con cinco centros estereogénicos contiguos.
  • Síntesis diastereospecífica de estructuras complejas de lactamo.
  • Resolución cinética exitosa de los alenoatos racémicos, dando como resultado productos enriquecidos ópticamente.

Conclusiones:

  • El NUSIOC-Fos es un catalizador eficaz para las reacciones dominó enantioselectivas.
  • El proceso de dominó desarrollado proporciona un acceso eficiente a los gamma-lactamas estereoquímicamente ricos.
  • El método de resolución cinética expande la utilidad de los alenoatos quirales en la síntesis.